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TI-2026-45051 Aliases CVE-2026-63101GHSA-ggm5-8rm7-3jgc

Open Event Server 1.19.1 Unauthenticated Member Roster Export via CSV Export Endpoint

Priority HIGH 77CWE-306Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
High · None · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-306.

Summary

Open Event Server through 1.19.1 contains a missing authentication vulnerability that allows unauthenticated attackers to export the complete member roster of any group, including email addresses, names, join dates, and roles, by submitting requests to the group followers CSV export endpoint which lacks any authentication decorator. Attackers can enumerate sequential group IDs via brute-force, trigger an export via the unauthenticated POST endpoint, then poll the unauthenticated task status endpoint until completion to retrieve a download URL containing the full member CSV.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0052 44th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
fossasiaopen-event-serverup to 1.19.1—No fix listedCNA
  • open-event-server Vendorfossasia Affected up to 1.19.1 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-63101
  2. 2026-10-03 Alias added: GHSA-ggm5-8rm7-3jgc

References

Exploit 1

  • TI-2025-04778 fossasia open-event-server Mail Verification mail.py send_email_change_user_email… CVSS 4.0MEDIUM 6.3
  • TI-2020-03528 Directory Traversal Vulnerability in SUSI.AI Server CVSS 3.1CRITICAL 9.1
  • TI-2026-85470 Authorization bypass in eventyay-exhibition leaks attendee data CVSS 4.0LOW 2.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences